Scientific Notation Converter
Convert between decimal, scientific, engineering, and E notation instantly.
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Notation Converter
Accepts decimal numbers and E notation (e.g. 1.2345e9).
How to Use
- Enter a number — Type any decimal number or E notation (e.g. 1.23e-4).
- Instant conversion — See the result in decimal, scientific, engineering, and E notation.
- Copy — Use the copy buttons to copy any notation format.
What are Scientific and Engineering Notations?
Scientific notation expresses numbers as a × 10^b where 1 ≤ |a| < 10. It is widely used in science and engineering to represent very large or very small numbers compactly.
Engineering notation is similar but the exponent is always a multiple of 3, matching SI prefix conventions (milli, kilo, mega, etc.).
E notation is a computer-friendly format (e.g. 1.23e+5) used in programming and calculators.
Frequently Asked Questions
What is the difference between scientific and engineering notation?
Scientific notation has an exponent such that the coefficient is between 1 and 10. Engineering notation restricts exponents to multiples of 3, making it align with SI prefixes like kilo (10³), mega (10⁶), and milli (10⁻³).
How do I write a number in E notation?
E notation uses the format m × 10^n as men or mE+n. For example, 1.23 × 10⁵ is written as 1.23e+5 or 1.23E5.
What are common SI prefixes for engineering notation?
Common prefixes include milli (10⁻³, m), kilo (10³, k), mega (10⁶, M), giga (10⁹, G), tera (10¹², T), micro (10⁻⁶, µ), and nano (10⁻⁹, n).